US6637687B2 - Shearbar for a forage harvester - Google Patents

Shearbar for a forage harvester Download PDF

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Publication number
US6637687B2
US6637687B2 US10/156,531 US15653102A US6637687B2 US 6637687 B2 US6637687 B2 US 6637687B2 US 15653102 A US15653102 A US 15653102A US 6637687 B2 US6637687 B2 US 6637687B2
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United States
Prior art keywords
shearbar
hardfacing
region
layer
top surface
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Expired - Lifetime
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US10/156,531
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English (en)
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US20020179759A1 (en
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Joseph Dillon
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Lund International BV
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Lund International BV
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Assigned to LUND INTERNATIONAL B.V. reassignment LUND INTERNATIONAL B.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DILLON, JOSEPH
Publication of US20020179759A1 publication Critical patent/US20020179759A1/en
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
    • A01F29/00—Cutting apparatus specially adapted for cutting hay, straw or the like
    • A01F29/09—Details

Definitions

  • This invention relates to a shearbar for a forage harvester.
  • the plant material When harvesting forage material such as grass, maize and other standing plants, the plant material is first cut from its root, close to the ground, and then conveyed into the forage harvester to a rotary cutter.
  • the rotary cutter is typically a drum carrying a series of knives whose purpose is fine chopping of the crop conveyed into the harvester.
  • the shearbar is located such that in use the knives successively approach the shearbar at an angle to cut the maize or other crop at the edge of the shearbar by a scissors-like action. The edge of the shearbar thus acts as a fixed counter knife to the knives of the rotary cutter.
  • a wear resistant coating known as hardfacing to the top surface of the shearbar, such hardfacing extending to the cutting edge.
  • cladding wear resistant coating
  • a top coating of tungsten or chromium carbide, or other carbide-based hardfacing, in the region of 1-2 mm thick has been used.
  • the top coating of hardfacing when ground or machined to the desired size of the finished part provides a square edge for the knives on the drum to cut against. It also provides significant wear protection against erosion caused by a large volume of abrasive plant matter passing over the top of the shearbar. The sharp square edge is important for reduction of the load on the machine required to cut the crop and also in prolonging the life of the knife and the shearbar.
  • a problem with this construction is the development of a wear gully on the vertical side of the shearbar below the cutting edge of the wear resistant coating.
  • This wear gully appears in the main body of the shearbar which is typically made of a mild steel, a medium carbon alloy steel of relatively low hardness or a plain carbon steel of low hardness.
  • the cutting edge of the coating becomes unsupported underneath and projects freely from the main body of the shearbar. When unsupported, the coating can chip when it comes into impact with items such as stones or foreign objects picked up by the harvester.
  • a shearbar comprising an elongated steel body having a top surface covered with a layer of hardfacing material along at least one longitudinal edge to act as a counter knife to a rotary cutter, the body having a region extending along and immediately below the longitudinal edge of the hardfacing layer, the region having a hardness intermediate that of the steel body and the hardfacing layer.
  • the said region is an inlay. In another embodiment it is a locally heat-hardened portion of the body.
  • an inlay it is preferably made of high alloy or ‘tool’ steel, most preferably with hardness of from 40 to 70 Hrc.
  • ‘tool’ steel has the added advantage of high impact resistance, enhancing the performance of the shearbar under a range of harvesting conditions. This performance enhancement would not be achievable with thermal sprayed hardfacing or PTA deposit hardfacing which are common in the industry.
  • FIG. 5 are cross-sectional views of shearbars which are highly elongated in the direction normal to the plane of the drawing.
  • FIG. 1 is a side view of a first embodiment of shearbar according to the invention
  • FIG. 2 is a cross-section through the shearbar taken on the line A—A in FIG. 1;
  • FIG. 3 is a plan view of the shearbar
  • FIG. 4 is a cross-section through a second embodiment of shearbar according to the invention.
  • FIG. 5, previously described, show various prior art shearbars.
  • the shearbar comprises an elongate mild steel body 10 of substantially rectangular cross-section.
  • holes 12 which have a number of functions including allowing the shearbar to be removably bolted in position on a forage harvester. Holes also may allow for adjustment of shearbar position relative to the knives on the drum. There may also be holes to hold sensors and there are some designs which have no holes at all and use clamps to fasten the shearbar to the machine.
  • top surface 14 of the body 10 between the holes 12 is clad with a 1-2 mm thick coating 16 of a hardfacing material such as Brazecoat M mat material, marketed by Innobraze GmbH.
  • the coating 16 extends the full width of the top surface 14 to form two parallel square (right-angled) longitudinal cutting edges 18 , either of which may be positioned against the rotary cutter to act as a counter knife simply by unfastening the shearbar and turning it round.
  • the coating 16 may comprise discrete strip(s) running along either one or both longitudinal edges of the top surface 14 of the body 10 .
  • each vertical side 20 of the body 10 has a respective steel inlay 22 extending along and immediately below each edge 18 of the coating 16 .
  • the inlays 22 have a hardness intermediate that of the mild steel body 10 and the coating 16 , and are preferably made of tool steel with a hardness of from 40 to 70 Hrc.
  • the inlays 22 arc welded in place on the body 10 prior to placing the coating 16 , after which the shearbar is ground and/or machined to its final dimensions.
  • the steel body 10 is heat-treated to locally harden the body along its top outer corners to form a pair of strips 22 A running along and immediately below the longitudinal edges 18 of the coating 16 .
  • the strips 22 A have a hardness intermediate that of the bulk of the steel body 10 and the coating 16 .
  • the hardened strips 22 A may be formed, prior to deposition of the coating 16 , by heating the corners of the body 10 using an induction coil followed by quenching. Alternatively, the corners may be flame-heated followed by quenching.
  • the hardened strip 22 A or tool steel inlays 22 prevent or delay the wear of the vertical sides 20 underneath the hardfacing layer 16 .
  • the hardfacing layer 16 itself provides the cutting edges 18 for the shearbar and a hard wearing surface for dealing with a large variety of plant matter for forage.

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Heat Treatment Of Articles (AREA)
  • Threshing Machine Elements (AREA)
US10/156,531 2001-06-05 2002-05-28 Shearbar for a forage harvester Expired - Lifetime US6637687B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IES2001-0543 2001-06-05
IE20010543 2001-06-05
IES20010543 2001-06-05

Publications (2)

Publication Number Publication Date
US20020179759A1 US20020179759A1 (en) 2002-12-05
US6637687B2 true US6637687B2 (en) 2003-10-28

Family

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Family Applications (1)

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US10/156,531 Expired - Lifetime US6637687B2 (en) 2001-06-05 2002-05-28 Shearbar for a forage harvester

Country Status (4)

Country Link
US (1) US6637687B2 (de)
EP (1) EP1264535B1 (de)
AT (1) ATE324778T1 (de)
DE (1) DE60211063T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016186528A1 (en) 2015-05-15 2016-11-24 Janicki Dominik Method for manufacturing knives for forage harvesters, in particular shear bars
US20170020066A1 (en) * 2015-02-24 2017-01-26 Gebrueder Busatis Gesellschaft M.B.H. Cutter bar

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7100651B1 (en) * 2005-08-09 2006-09-05 Sandvik Intellectual Property Ab Stump grinding disk and wear strips therefor
US20080233296A1 (en) * 2007-03-21 2008-09-25 Gopal Subray Revankar Method Of Applying A Relatively Thick Protective Coating To A Sheet Metal Substrate
DE102013211774A1 (de) 2013-06-21 2014-12-24 Deere & Company Erntegutbearbeitungs- und/oder Förderelement für einen Feldhäcksler
DE102013211829B4 (de) 2013-06-21 2023-03-16 Deere & Company Element zum Abstützen und/oder Leiten von Erntegut in einer Erntemaschine
AT524756A1 (de) * 2021-02-26 2022-09-15 Gebrueder Busatis Ges M B H Schneidleiste insbesondere Gegenschneide für Häckselmaschinen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805660A (en) 1973-01-15 1974-04-23 Gehl Co Shear bar for forage harvesters or the like
EP0022053A1 (de) 1979-06-25 1981-01-07 Rexnord Inc. Gegenschneide mit eingekerbter Schnittkante
US4425260A (en) 1982-09-30 1984-01-10 Monsanto Company Catalysts for the oxidation and ammoxidation of alcohols
DE8700403U1 (de) 1987-01-09 1987-05-14 Karl Mengele & Söhne Maschinenfabrik und Eisengießerei GmbH & Co, 8870 Günzburg Gegenschneide
EP0829198A1 (de) 1996-09-16 1998-03-18 Busatis GmbH Häckselvorrichtung
EP0878123A2 (de) 1997-05-16 1998-11-18 Busatis GmbH Schneidleiste

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4428260A (en) * 1982-03-01 1984-01-31 Sperry Corporation Method of forming a cutting edge

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805660A (en) 1973-01-15 1974-04-23 Gehl Co Shear bar for forage harvesters or the like
EP0022053A1 (de) 1979-06-25 1981-01-07 Rexnord Inc. Gegenschneide mit eingekerbter Schnittkante
US4425260A (en) 1982-09-30 1984-01-10 Monsanto Company Catalysts for the oxidation and ammoxidation of alcohols
DE8700403U1 (de) 1987-01-09 1987-05-14 Karl Mengele & Söhne Maschinenfabrik und Eisengießerei GmbH & Co, 8870 Günzburg Gegenschneide
EP0829198A1 (de) 1996-09-16 1998-03-18 Busatis GmbH Häckselvorrichtung
EP0878123A2 (de) 1997-05-16 1998-11-18 Busatis GmbH Schneidleiste

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170020066A1 (en) * 2015-02-24 2017-01-26 Gebrueder Busatis Gesellschaft M.B.H. Cutter bar
US9894833B2 (en) * 2015-02-24 2018-02-20 Gebrueder Busatis Gesellschaft M.B.H. Cutter bar
WO2016186528A1 (en) 2015-05-15 2016-11-24 Janicki Dominik Method for manufacturing knives for forage harvesters, in particular shear bars

Also Published As

Publication number Publication date
US20020179759A1 (en) 2002-12-05
ATE324778T1 (de) 2006-06-15
DE60211063D1 (de) 2006-06-08
EP1264535A1 (de) 2002-12-11
DE60211063T2 (de) 2006-11-23
EP1264535B1 (de) 2006-05-03

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